Scientists find the same type of index fossil in two different locations on earth. what can they conclude from this discovery? the fossils are different ages due to the location. the index fossils are the same geological age. one index fossil is older than the other. there is not enough information to make a conclusion.

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

Consider the model of the oxygen cycle on earth. the majority of earth's oxygen reservoirs are found in the a) atmosphere. b) biosphere. c) hydrosphere. d) lithosphere.

Which statement describes characteristics of planarians? a they live in oceans, are parasites, and reproduce only sexually. b they live in fresh water, are parasites, and reproduce only asexually. c they live in oceans, are free living, and reproduce sexually and asexually. d they live in fresh water, are free living, and reproduce sexually and asexually.